Long suggested as a possible split, the american race of Black Tern is distinguishable in the field,
especially in immature and winter plumages, and as
such has lead to a few British records. In common with "ours", they tend to be passage migrants in some areas,
but extend from California to southern parts of Canada.
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HOMEPAGE
AMERICAN BLACK TERN
Chlidonias (nigra) surinamensis
